tests/acpi: disable tests/data/acpi/q35/DSDT.mmio64 updates

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

tests/qtest/bios-tables-test-allowed-diff.h

@@ -1,2 +1 @@
 /* List of comma-separated changed AML files to ignore */
-"tests/data/acpi/q35/DSDT.mmio64",